Synthesis of the pyrrolo[2,3-c]carbazole core of the dictyodendrins.

The pyrrolo[2,3-c]carbazole , the common core of the marine alkaloids known as the dictyodendrins, has been synthesised. The sequence is based on a Suzuki cross-coupling reaction between the pyrrole fragment and the indole fragment , followed by tandem photochemical 6pi-electrocyclization/aromatisation.